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(11) | EP 0 936 720 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Lamp lighting and battery charging control system for a vehicle |
| (57) Provided is a lamp lighting and battery charging control system for a vehicle which
can favorably use the electric power produced from the engine-driven electric generator
in both lamp lighting and battery charging. According to one embodiment of the present
invention, the conventional full-wave and half-wave techniques are performed alternately
in every other cycle of the AC voltage from the generator. Thus, the lamp is lighted
alternately by a full-wave and a negative half-wave of the AC voltage in every other
cycle, ensuring sufficient luminous intensity of the lamp even at low engine speeds,
while every other positive half-waves which can be used exclusively in charging the
battery can prevent insufficient battery charging at low engine speeds. According
to another embodiment of the present invention, the turning on of the switching device
for controlling the electric current of the lamp is gradually delayed so that the
time duration of the electric current flowing through the lamp is gradually decreased
as the engine speed increases, preventing an excessive electric current from damaging
the lamp in the high engine speed range. |